Valve-truing mechanism.



H. H. E. NEMITZ. VALVE TRUING MECHANISM.

APPLICATION FILED JUNE 7, 1902.

N0 MODEL.

PATBNTED MAR. 3, 1903.

I Quanta lltrrTnn STATES ATET rricn.

HERMAN H. E. NEMITZ, OF \VALTHAM, MINNESOTA.

VALVE-TRUING MECHANISM.

PECIFICATION forming part of Letters Patent No. 722,134, dated March 3, 1903.

Application filed June '7, 1902. $erinl No. 110,682- (No model.)

To (tZZ whom it may concern.-

Be it known that I, HERMAN H. E. N EMITZ,a citizen of the United States, residing at VValtham,in the county of Mower and State of Minnesota, have invented new and useful Improvements in Valve-Truing Mechanism, of which the following is a specification.

In steam, Water, and like systems where valves are employed it frequently occurs that owing to wear or other causes the valvesbecomeleakyand defective,anditis the common practice to repair these faulty valves by the process of regrinding. This is accomplished by applying to the active face of the valve and its seat an abrasive material, such as emery or the like, pressing the valve accurately and firmly upon its seat, and rotating the same until all irregularities are removed and the parts again perfectly coincide to form a tight joint. At the present day there is quite extensively used in this connection a class of devices known as valve truing or grinding machines. These devices as heretofore generally constructed comprise a clamping means for attaching the same to the valve-casing or the pipe adjacent thereto and a screw or like means for accurately centering the valve and pressing it home to its seat; but in practice when one of these devices is employed it is necessary for the operator to grasp by hand the valve-stem and manually rotate the valve in order to accomplish the grinding operation.

My invention relates to and has for its objects to produce a device of this nature which will be simple and durable of construction, efficient in operation, and at the same time one which will obviate the necessity of manually rotating the valve by incorporating mechanical means for so doing.

To these ends the invention comprises in a portable valve truing or grinding machine the combination, with a clamp, of means for centering and holding the valve and means for mechanically rotating the same to effect the grinding operation.

The invention further consists in the details of construction and combination of parts more fully hereinafter described.

In the accompanying drawings, Figure 1 is a side elevation of a valve-truing machine in accordance with my invention. Fig. 2 is a front elevation of the clamping device.

Referring to the drawings, 1 is the main body of the device, composed, preferably, of a section of gas pipe or the like, having screwed into its lower end the primary member 2 of the clamping, device. Attached to opposite sides of member 2 are two small rods 3 and 4E, projecting laterally therefrom for a short distance and bent downward at right angles to receive a cross-piece 5, carrying the secondary clamping member 6. The rods 3 and 4 are screwthreaded, and have nuts tapped thereon for operating the member 6 to clamp or release a pipe, as in dotted lines in Fig. 1. To the upper end of the body 1 is suitably attached a vertical internally-threaded socket 7, in which is mounted the centering-screw 8, provided at its top with the usual hand-wheel 9, and at its lower end with the centering-point 10.

11 is a sleeve mounted loosely on screw 8 near its lower end.v Tapped into the sleeve is one end of a short rod 12, which projects laterally therefrom, with its other end entering a vertical slot 13, formed in the main body 1. This construction prevents the rotation of the sleeve, but admits of its moving vertically with the screw 8.

14 is a vertically-disposed bevel-gear mounted for rotation on a horizontal spindle 15, projecting from sleeve 11 and provided with crank 16, by which it is operated.

17 is a horizontallydisposed bevel-gear mounted loosely for rotation on the lower end of centering-screw 8 and in mesh with and adapted to be driven by gear lat.

18. is a finger carried by and depending vertically from gear 17 for the purpose to be eX plained.

In operation the device is clamped to a pipe adjacent to the valve to be operated upon in the manner illustrated in Fig. 1. Centeringscrew 8 is adjusted vertically by means of hand-wheel 9 until its point 10 engagesand centers the valve and presses the same against its seat. At the same time finger 18 engages between the webs of the hand-wheel 0f the valve. The attendant grasps and turns crank 16 to drive gear 14, which in turn drives gear 17, and thus owing to the engagementof finger 18 with the valve-wheel rapidly rotates the valve upon its seat to accomplish the grinding and truing of the parts.

Having thus described my invention, what 5 I claim is In a portable valve truing and grinding machine, the combination of a clamp having a slotted body rising therefrom and carrying a vertically-disposed screw-socket at its upper xo end to one side of the vertical plane of the body, a centering-screw mounted in the socket and having a sleeve on the lower extremity thereof carrying operatingears, a rod projecting from the sleeve through the slot of the body, and a finger depending from one of I5 the gears.

In testimony whereof I affix my signature in presence of two Witnesses.

HERMAN H. E. NEMITZ. Witnesses:

H. S. SMITH, H. E. SMITH. 

